An urban planning specialist is advising the government to be careful changing a development plan he believes was already working

The Government's revising the city's housing capacity number in its new plan - from just over two-million, to 1.6 million.

It is focusing more on building in the city, and by transport hubs, rather than suburbs.

Mt Hobson Group Director Hamish Firth says you're creating fear from something that people don't get.

He says you create paper capacity, but also community backlash, land value distortion and probably not any extra homes.